xktv_ft.h

freetype的C/C++ 的应用源代码,经过实际使用,稳定可靠 对于在嵌入式linux系统中使用TTF字库的情况尤其适合

#ifndef XKTV_FT_C
#define XKTV_FT_C
/*****************************************************************************/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <ft2build.h>
#include FT_FREETYPE_H
/*****************************************************************************/
struct BitPlat
{
	unsigned char *	m_bf;

	unsigned long	m_hy;
	unsigned long	m_wx;

	unsigned long	m_hu;
	unsigned long	m_wu;
};
/*****************************************************************************/
void BitPlat_freeplat(struct BitPlat *);
void BitPlat_fillplat(struct BitPlat *,unsigned char);
long BitPlat_initplat(struct BitPlat *,unsigned long , unsigned long);
/*****************************************************************************/
void BitPlat_freeplat(struct BitPlat * vplat)
{
	if(vplat->m_bf != NULL)
	{
		free( vplat->m_bf);
		vplat->m_bf = NULL;
	}

	vplat->m_hy = 0;
	vplat->m_wx = 0;

	vplat->m_hu = 0;
	vplat->m_wu = 0;
}

long BitPlat_initplat(struct BitPlat * vplat,
	unsigned long w, unsigned long h)
{
	if((vplat->m_bf = (unsigned char *)
		malloc(w * h)) == NULL)
	{
		vplat->m_hy = 0;
		vplat->m_wx = 0;

		vplat->m_hu = 0;
		vplat->m_wu = 0;

		return(0);
	}
	else
	{
		vplat->m_hy = h;
		vplat->m_wx = w;

		vplat->m_hu = 0;
		vplat->m_wu = 0;

		return(1);
	}
}

void BitPlat_fillplat(struct BitPlat * vplat,
	unsigned char color)
{
	unsigned long i,sz;

	sz = vplat->m_hy * vplat->m_wx;

	for(i = 0; i < sz; i ++)
	{
		vplat->m_bf[i] = color;
	}
}
/*****************************************************************************/
/*****************************************************************************/
static FT_Library	g_ttf_lib;
static FT_Error		g_ttf_err;

static FT_Face		g_ttf_face[8];
/*****************************************************************************/
void ttfFont_init(void);
void ttfFont_quit(void);

void ttfFont_freefont(FT_Face *);
long ttfFont_loadfont(FT_Face *,char *);

long ttfFont_fontsize(FT_Face *,long *);

long ttfFont_drawtext(FT_Face *,char *,struct BitPlat *,
	unsigned char);

long ttfFont_bandtext(FT_Face *,char *,struct BitPlat *,
	unsigned char,unsigned char);

void ttfFont_ptext(FT_Bitmap *,int,int,struct BitPlat *,
	unsigned char);

void ttfFont_pband(FT_Bitmap *,int,int,struct BitPlat *,
	unsigned char,unsigned char);
/*****************************************************************************/
void ttfFont_init(void)
{
	g_ttf_err =
	FT_Init_FreeType(&g_ttf_lib);
}

void ttfFont_quit(void)
{
	FT_Done_FreeType( g_ttf_lib);
}
/*****************************************************************************/
void ttfFont_freefont(FT_Face *p_face)
{
	FT_Done_Face(*p_face);
}

long ttfFont_loadfont(FT_Face *p_face,char *s_file)
{
	g_ttf_err =
	FT_New_Face(g_ttf_lib, s_file, 0, p_face);

	return(g_ttf_err == 0);
}

long ttfFont_fontsize(FT_Face *p_face,long *p_size)
{
	g_ttf_err =
	FT_Set_Pixel_Sizes(*p_face, p_size[0], p_size[1]);

	return(g_ttf_err == 0);
}

long ttfFont_drawtext(FT_Face *p_face, char *s_utf8,struct BitPlat *p_plat,
	unsigned char color)
{
	static FT_Matrix matrix;
	static FT_Vector vector;

	wchar_t *pstr,wstr[256] = {0,0,0,0,};
	str_utf8_to_wchar(wstr, s_utf8, 255);

	matrix.xx = 0x10000L;
	matrix.xy = 0;
	matrix.yx = 0;
	matrix.yy = 0x10000L;

	vector.x = 0;
	vector.y = p_plat->m_hy << 5;

	for(pstr = wstr; *pstr ; pstr ++)
	{
		FT_Set_Transform(*p_face, &matrix, &vector);

		g_ttf_err =
		FT_Load_Char(*p_face,*pstr, FT_LOAD_RENDER);

		if(g_ttf_err != 0)
			continue;

		ttfFont_ptext(&((*p_face)->glyph->bitmap),
			(*p_face)->glyph->bitmap_left,
			p_plat->m_hy -
			(*p_face)->glyph->bitmap_top,
			p_plat,color);

		vector.x += (*p_face)->glyph->advance.x;
		vector.y += (*p_face)->glyph->advance.y;
	}

	p_plat->m_wu =  (*p_face)->glyph->bitmap_left +
			(*p_face)->glyph->bitmap.width;

	return(pstr - wstr);
}

long ttfFont_bandtext(FT_Face *p_face,char *s_utf8,struct BitPlat *p_plat,
	unsigned char text_color,unsigned char band_color)
{
	static FT_Matrix matrix;
	static FT_Vector vector;

	wchar_t *pstr,wstr[256] = {0,0,0,0,};
	str_utf8_to_wchar(wstr, s_utf8, 255);

	matrix.xx = 0x10000L;
	matrix.xy = 0;
	matrix.yx = 0;
	matrix.yy = 0x10000L;

	vector.x = 0;
	vector.y = p_plat->m_hy << 5;

	for(pstr = wstr; *pstr ; pstr ++)
	{
		FT_Set_Transform(*p_face, &matrix, &vector);

		g_ttf_err =
		FT_Load_Char(*p_face,*pstr, FT_LOAD_RENDER);

		if(g_ttf_err != 0)
			continue;

		ttfFont_pband(&((*p_face)->glyph->bitmap),
			(*p_face)->glyph->bitmap_left,
			p_plat->m_hy -
			(*p_face)->glyph->bitmap_top,
			p_plat,text_color,band_color);

		vector.x += (*p_face)->glyph->advance.x;
		vector.y += (*p_face)->glyph->advance.y;
	}

	p_plat->m_wu =  (*p_face)->glyph->bitmap_left +
			(*p_face)->glyph->bitmap.width;

	return(pstr - wstr);
}
/*****************************************************************************/
void ttfFont_ptext(FT_Bitmap *p_bmp, int x, int y,struct BitPlat *p_plat,
	unsigned char color)
{
	unsigned char * p_src;
	unsigned char * p_dst;
	unsigned char * p_tmp;

	int w = p_bmp->width;
	int h = p_bmp->rows;

	if(x < 0 || (unsigned)(x + w) >= p_plat->m_wx)
		return;

	if(y < 0 || (unsigned)(y + h) >= p_plat->m_hy)
		return;

	if(p_plat->m_hu < (unsigned)(y + h))
	   p_plat->m_hu = (unsigned)(y + h);

	p_src  = p_bmp->buffer;
	p_dst  = p_plat->m_bf + x;
	p_dst += p_plat->m_wx * y;

	for(y = 0; y < h; y ++)
	{
		p_tmp = p_dst + y * p_plat->m_wx;

		for(x = 0; x < w; x ++)
		{
			if(*p_src > 32)
				*p_tmp = color;

			p_src ++;
			p_tmp ++;
		}
	}
}

void ttfFont_pband(FT_Bitmap *p_bmp, int x, int y,struct BitPlat *p_plat,
	unsigned char text_color,unsigned char band_color)
{
	unsigned char * p_src;
	unsigned char * p_dst;

	unsigned char * p_top;
	unsigned char * p_lef;
	unsigned char * p_bot;
	unsigned char * p_rig;

	int w = p_bmp->width;
	int h = p_bmp->rows;

	if(x < 0 || (unsigned)(x + w + 2) >= p_plat->m_wx)
		return;

	if(y < 0 || (unsigned)(y + h + 2) >= p_plat->m_hy)
		return;

	if(p_plat->m_hu < (unsigned)(y + h))
	   p_plat->m_hu = (unsigned)(y + h);

	p_src  = p_bmp->buffer;
	p_dst  = p_plat->m_bf + x;
	p_dst += p_plat->m_wx * y;

	for(y = 0; y < h; y ++)
	{
		p_lef = p_dst + p_plat->m_wx * y;
		p_top = p_lef + 1;
		p_lef = p_lef + p_plat->m_wx;
		p_rig = p_lef + 2;
		p_bot = p_lef + p_plat->m_wx + 1;

		for(x = 0; x < w; x ++)
		{
			if(*p_src > 32)
			{
				*p_top = band_color;
				*p_lef = band_color;
				*p_rig = band_color;
				*p_bot = band_color;
			}

			p_src ++;
			p_top ++;
			p_lef ++;
			p_rig ++;
			p_bot ++;
		}
	}

	p_src = p_bmp->buffer;

	for(y = 0; y < h; y ++)
	{
		p_lef = p_dst + p_plat->m_wx * y;
		p_top = p_lef + p_plat->m_wx + 1;

		for(x = 0; x < w; x ++)
		{
			if(*p_src > 32)
			{
				*p_top = text_color;
			}

			p_src ++;
			p_top ++;
		}
	}
}
/*****************************************************************************/
#endif/*XKTV_FT_C*/